Manhole construction



May 15, 1934. c MAYER 1,959,171

MANHOLE CONSTRUCTION Filed July 26, 1930 7 BY Z 5 -11 r 22 A TTORNE Y6Patented May 15, 1934 UNITED STATES PATENT OFFICE 1 Claim.

My invention relates to an adapter for use in road resurfacing work.

In the past, to the best of my knowledge and.

belief, when contractors have resurfaced road--' ways in which manholecasings, valve chambers, and electric ducts are inserted, in order toraise the level of the manhole cap to correspond with the resurfacedlevel of the road it has been customary to dig up the entire manholecasing and extend the masonry to a desired level, and then. 1

re-position the manhole casing so that the top cap receiving portion ofthe casing will be elevated level with the resurfaced road.

It is the object of my invention to provide an adapter for use in roadresurfacing work which will enable the road builder to avoid thenecessity of digging up manhole casings and elevating: them to a desiredlevel.

Specifically it is the object of my invention to provide an adapterhaving an annular flanged portion which will be of corresponding size tothe dimensions of the manhole cap, and which will have an opening ofsuitable size to receive the cap and to firmly anchor the adapter on themanhole casing so that the jars brought about, by trafiic will not tendto loosen the adapter.

The above objects and other objects to which reference will be made inthe accompanying description, I accomplish by that certain constructionof which I have illustrated a preferred embodiment.

Referring to the drawing:

Figure 1 is a view partly in section, of a manhole casing prior to theresurfacing of the road,

" the casing being of usual construction.

Figure 2 is a sectional view showing one way of practicing my inventionby the insertion of a manhole adapter within the manhole casing, so thatthe level at which the manhole cap will be supported will conform to theresurfaced plane of the roadway.

Figure 3 is a sectional view of a manhole adapter.

I have illustrated my invention as applied to a round manhole casing,but it will be understood that my new construction may be employed withdifferent shaped casings, such as are employed for valve chambers,electric ducts, and the like.

In Figure 1 I have illustrated the sewer masonry to which the manholeextends at 1. The manhole casing 2 has an annular flanged base 3 whichis positioned on the top surface of the masonry wall. The great Weightof the manhole casing, and the fact that the road bed 4 and the roadwaysurface 5 are filled in about it, will keep the casing in position.

An annular opening 6 in the top of the casing receives the manhole capindicated at 7.

In Figure 2 I have illustrated the manner of use of my novel adapterwhich (referring to Figure 3) it will be noted, has a flanged portion 8of similar size as the manhole cap and an annular recessed portion 9into which the cap '7 will Depending on the new level of the roadwayafter it is resurfaced, I provide adapters of different depths so thatthe roadway may be raised a desired amount.

casing.

Supposing that a roadway is resurfaced every If the level is raised twoinches the first ten years and two inches more the second ten years, thefirst year an adapter two inches long will be required, and after thishas been in use for ten years it may be removed and a four inch adaptedpositioned in the manhole casing.

Having thus described my invention, what I claim as new and desire tosecure by Letters ten years.

Patent, is

A manhole adapter for use with a manhole casing having a top lid spaceand downwardly facing engaging means accessible from its interior,comprising a ring shaped on its lower side to fit said lid space andshaped on its upper side to be fitted by the manhole lid, and havinginterior upwardly facing engaging means spaced down from its lidreceiving part, tie rods, and nuts screwed on the tie rods and engagingover said engaging means of the adapter, said tie rods extending down toenter the interior of the casing and having lower hook portions toengage under the engaging means of the casing, to hold the adapterrigidly unitary with the casing upon tightening of the nuts onto theengaging means of the adapter.

NORMAN C. MAYER.

